Dynamo-electric machine.



No. 887,639. PATENTED MAY 12, 1908.

L. R. HORN UNG.

DYNAMO ELECTRIC MACHINE. APPLICATION FILED FEB. 2a. 1906.

, INvENTaR:

MTNESSEE' Louis 7? Jfw'lzzay W 7 BY UNITED STATES P gTE-NT OFFICE.

LOUIS R HORNUNG, OF NORWOOD, OHIO, AS SIGNOR TO THE BULLOCK ELECTRIC MANUFAC- TURI NG COMPANY, A CORPORATION OF OHIO.

DYNAMIC-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented May 12, 1908.

Application filed February 28, 1906. Serial No. 303,370.'

It has been found that in machines of large I diameter having long brush-forks extending from the brush-yoke and in machines having long commutators and hence brush-studs of a considerable length, there isconsiderable vi- I nect the brus inwardly extendin olebration in the brush-forks and studs when the machine is operated'at hi h speed, which vibration causes a disagreeab e chattering of, and injurious, s arking at, the brushes.

The object o my invention is to so brace and connect the brush-forks and studs that this vibration and sparking is entirely shimnated.

In carryin out my invention, I intercon- -studs by straight stifl' links or rods. Each of these connectlng links or rods consists preferably of an insulating portion. provided with two metallic caps or endpieces which engage the studs.

My invention further consists in the details of construction and combinations of elements described in the specification and set forth in the appended claims.

For a more complete understanding of my invention, reference ishad to the accompanying drawings, in'which I Figure 1 is an end-elevation of a machine equip ed with my invention, arts of the machine eing omitted for the sa e of clearness Fig. 2 is a sectional elevation of a portion of the commutator-end showing a brush-fork in elevation and the brush-yoke and :1 connecting link in section; and Fig. 3 is a perspective of one of the connecting links or bars.

, Referring now to the figures of the drawing, I have shown at 10 the shaft of a d amo-olectric machine on which is mounted iz he armature 1]. and commutator 12. Surrounding the armature is a field-frame 13 having iec'es 14. At the commutator-end o t e fie d frame are a plurality of rollers 15, (three being shown in this case) which support the brush-yoke 16 in the customary manner. This yoke as in the well known construction consists of an outer ring 17, adapted to engage the sup orting rollers 15 and aninner ring 18 joined to the outer ring 17 by inwardly and laterally extending arms 19 Connected to the inner ring 18 by bolts 20 and insulated therefrom are a number of brushforks 21, the number of the latter depending u on the number of oles in the machine. ach brush-fork conslsts of a radial portion 22 by which it is connected to the inner ring 18 of the brush yoke and apair of arms 23 and 24 extendin toward the commutator. Each brush-for supports at the inner ends of the arms 23 and 24, a. brushstud 25, which sup orts as in the usual manner, a number 0 brush -holders 26 and brushes 26 arranged side by side, along the commutator.

In some. machines especi-all in machines of large diameter the arms oft e brush-forks are frequently of considerable-length and in some types of machines the arms of the brushforks are spaced a considerable distance apart and hence lon brush-studs must be employed. In eit er case there is considerable vibration in the arms of the brush-forks and brush-studs when the machine is operated at high speed, causi the chattering and s arkin previously re erred to. To avoi this vi ration, I firml brace all the brush-studs by connectin al the latter together by strai ht, stiff 'nks, bars, or rods 27. vAs 1s clear y shown in Fig. 2, 'each brush-stud extends beyond the outer arm 24 of the corresponding brush-fork and is threaded to receive the nuts 28 and 29, which are .on o posite sides of the arms 24 and hold the stu s in position, and to receive the nuts 30 which are eilnployed to hold the connecting links in P By referring to Fig. 3 1t is seen that each link or bar 27, consists of two metal ca or end-lp1eces 31, and an intermediate straight insu portion 32 made preferably of atin wood. liiach end or cap-piece 31 in this case, consists of two pieces of metal, held to other by rivets 33, and each is provided with an elon ated opening 34 to be engaged by the brus -stud. The end-pieces are secured to the intermediate wooden portion byrivets 35. The ends of two links are mounted on each brush-stud and are held in position between the nuts 29 and 30, which links extend in opposite directions to the adjacent studs on both sides of the first mentioned stud; It is seen that the" group of links or bars form a continuous chain which extends entirely around the machine, It isalso seen that the straight'links or bars extending from stud tostud are short chords of'the circle-in which the brush-studsarelocated, which circle is'l I concentric with the axis of the machine.

I in my claims to cover all modifications which do not involve a departure from thwilpiritandscope of my invention.

atI "claim as new and desire to secure' by Letters Patent is-:

I. Ina dynamo-electric machine, a plu- 'rality of brushes, a number of brush-studs greater than two, and straight insulated links joining adjacent brush-studs for the'purpose of bracing same to prevent vibration-thereof.

2. In a dynamo-electric machine, atbrushyoke, brush-forks sup orted thereby, brushstud's supported at t e inner ends of said forks, and arrangedin a circle about the shaft axis, and a plurality of links connecting the corresponding ends of the brush-studs, said links being chords of said circle.

3. In a dynamo-electric machine, a. plural-f portion and a pair engagiiilig' the ends thereof.

"ity' of brush studs', supports therefor, and

straight insulated links or bars connecting the outerendsof said studs;

.4. Ida dynamo-'electricmachine, a plurality of brush-studs, links or bars connect vfill gkthe =o1'1ter; 'axis of adjacent studs, each orbarconsisti of astraight wooden metallic caps or headsdynamo-electnc machine, a pair of brush-studs,- and .a link or bar'joiningl said studs, said link consisting of a straight insu-' lating rod having metalhc caps or;end portionsenga g the studs 6. In a ynamo-electriemachine, aplurality of brush supporting members arranged in a circle about the shaft axis, and bracing 

